Starting-jack for engine fly-wheels.



m. 664,5"). Patented Dec. 25, I900.

J. F. TRUMBLE.

STARTING JACK FOR ENGINE FLY WHEELS.

(Application filed July 9, 1900.)

No Model.)

JIET'RUMBLE,

UNITED STATES PATENT OFFICE.

JAMES F. TRUMBLE, OF WHEELWRIGHT, MASSACHUSETTS, ASSIGNOR TO HIMSELF ANDGEORGE W. WHEELWRIGHT, OF SAME PLACE.

STARTING-JACK FOR ENGINE FLY-WHEELS.

SPECIFICATION forming part of Letters Patent No. 664,510, dated December25, 1900.

Application filed July 9, 1900. Serial No. 22,905. a. model.)-

To all whom it may concern:

Be it known that'L-JAMES F. TRUMBLE, a citizen of the UnitedStates,residing at Wheelwright, in the county of Worcester and State ofMassachusetts, have invented a new and useful Starting-Jack for EngineFly-Wheels, of which the following is a specification.

This invention relates to a handoperated attachment or starting-jack forturning engine fly-wheels by hand; and the object of this invention isto provide an efficient, simple, and inexpensive starting-jack havingclamping-jaws arranged to secure a strong bite or grip on the rim of afiy-wheel, said clamping-jaws being preferably connected together by anadjustable pivot, so that the jaws may be set or adjusted to cooperatewith fly-wheel rims of diflerent thicknesses.

To this end this invention consists of the starting-jacks for enginesand of the combinations of parts therein, as hereinafter described, andmore particularly pointed out in the claims at the end of thisspecification.

In the accompanying drawings, Figure 1 is a side view of an enginefly-wheel partially broken away, illustrating the application of mystartingjack thereto. Fig. 2 is a perspective View illustrating theclamping-jaws, and Fig. 3 is a detail view illustrating the constructionfor adjusting the pivot of the clamping-jaws to adapt the same tofly-wheel rims of varying thicknesses.

In nearly all large manufacturing plants it frequently happens that itis desirable to turn or operate the engine fly-wheel and the machinerydriven therefrom by hand. The occasion for doing this not only ariseswhen the engine is accidentally stopped upon one of its deadcenters, sothat the admission of steam will not start the same, but also wheneveralterations or changes are being made it is desirable to turn or operatethe machinery by hand in order to test the same before poweris applied,and in numerous instances also it is desirable to turn or operate themachinery by hand when steampressure is not available for running theengine. To provide connections for turning an engine fly-wheel by hand,a number of difierent forms of jacks have been devised. Some of thesejacks have been found in practice to be objectionable, as they do notsecure a sufficient leverage for turning or operating heavy fly-wheels,and nearly all of the engin-jacks which have heretofore been employedareobj ectionable because they cannot clamp or bite the fly-wheel rim withsufficient force to secure a reliable action. I The especial object ofmy present invention is therefore to provide an engine-jack havingclamping-jaws arranged to bite or clamp themselves firmly intoengagement with a flywheel rim, said jaws being preferably adj ustedtogether to adapt. the jack in connection with fly-wheels having rims ofvarying thicknesses. To this end an engine-jack constructed according tothis invention consists of a piece or elbow having a jaw for engagingthe inner side of a fly-wheel rim and an outside clamping-jaw having apivotal connection with said piece, which pivotal connec: tion ispreferably adjustable, the tail of the outside clamping-jaw having alink connection with an operating-lever which maybe pivoted in anordinary support.

Referring to the accompanying drawings and in detail, A designates anengine flywheel to which an engine-jack constructed according to myinvention is applied.

The engine-jack, as shown in the drawings, consists of a piece or elbow10, carrying a clamping-jaw 11 for engaging the inner side of thefly-wheel rim. The clamping-jaw 11, as herein illustrated, fits over theend of the elbow or piece 10, and one or more thin pieces of metal orshims 12 may be arranged back of the jaw 11 to take up wear and adjustthe jaw 11 as desired.

Connected to the elbow'or piece 10, preferably by means of an adjustablepivotal connection, is an outside clamping-jaw 13. To adjust the pivotalconnection between the piece 10 and outer clamping-jaw 13, the piece 10is preferably provided with a pivot-pin for receiving the piece 13,which pivot-pin may be adjusted or set to different positions. As shown,a pivot-pin, as 15, is carried by or formed integrally with a disk 14.The disk 14 is provided with a series of holes near its periphery, anyone of which may receive the screw 16 for fastening the same to thepiece 10. The pivot-pin 15 is eccentric with respect to its disk 14, sothat when the disk 14:

is turned so that difierent holes therein will be engaged by the screw16.the pivot-pin will be moved to difiereut positions in a slot in thepiece or elbow 10. An ordinary operating-lever 18 is pivotally mountedin the usual support 17, the front end of the operatinglever 18 beingconnected by links 19 to the rear end of the clamping-jaw 13.

The foot of the upright or support 17 may be provided with pins ordowels to engage sockets in the engine-room floor, as shown, so that theengine-jack may always be set in the same relative position with respectto the engine fly-wheel in connection with which the same is to be used.

In using an engine-jack as thus constructed to turn the fiy-wheel of anengine the jack ,is first set to the required position and theclamping-jaws adjusted as required by the thickness of the enginefly-wheel. When the operating-lever 18 is raised, the grip of theclamping-jaws on the fly-wheel will be relaxed and the clamping-jawswill swing or fall down in position to secure a new bite or grip uponthe wheel-rim, so that when the end of the operating-lever is moved downagain a powerful leverage will be exerted, which will first turn theouter clamping-jaw 1 3 to secure a firm bite or grip upon the enginefiy-wheel rim and will then act to lift or' raise both clamping-jaws toturn or advance the fly-wheel. I am aware that changes may be made inthe relative proportions and arrangements of parts in an engine-jackconstructed according to my invention by those who are skilled in theart without departing from the scope thereof. as expressed in theclaims. I do not wish, therefore, to be limited to the form ofengine-jack which I have herein shown and described; but

What I do claim, and desire to secure by Letters Patent of the UnitedStates, is- 1.. In a starting-jack for turning engine flywheels, thecombination of an elbow-piece having a jaw for engaging the inner sideof a fly-wheelrim, an outside clamping-jaw having a pivotal connectiontherewith, an operating-lever connected to operate the outsideclamping-jaw, and means for adjusting the pivotal connection of saidoutside clampingjaw to adapt the starting-jack for use in connectionwith fly-wheels having rims of varying thicknesses, substantially asdescribed.

2. In a starting-jack for turning engine flywheels, the combination of apiece or elbow having a jaw engaging the inner side of a flywheel rim, apivot-pin adjustably mounted in the piece or elbow, an outsideclampingjaw mounted on said adjustable pivot-pin, and an operating-leverconnected to the rear of the outside clamping-jaw, substantially asdescribed.

3. In a starting-jack for turning engine flywheels, the combination ofthe piece or elbow which carries the jaw engaging the in n-er side ofthe engine fly-wheel, a pivot-pin extending through a slot in the pieceor elbow which carries the inner clamping-jaw, a disk hav- 'ing a seriesof holes for receiving a screw to hold the pivot-pin in its adjustedposition, an outer clamping-jaw mounted on the pivot-pin, and anoperating-leverconnected to the outer clamping-jaw, substantially asdescribed.

' 4. In a starting-jack for turning engine flywheels, .thecombination-of the piece or elbow 10 having a jaw 11 for engaging theinner side of a-fly-wheel, a perforated disk 14 having an eccentricpivot-pin extending through a slot in the piece 1-0., a fastening-screw16 for holding the pivot-pin in its adj us-ted position, an outsideclamping-jaw l3 mounted .on the pivot-pin, and an operating-lever 18pivoted in a support 17 and connected by links 19 to the rear .e-ndofthe outer clamping-jaw 13, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses. v

JAMES F. TR'UMBLE.

Witnesses:

Louis W. SOUTHGATE, PHILIP W. SOUTHGATE.

granted December 25, 1900, upon the application of James F. Trumble, ofWheelwright, Massachusetts, for an improvement in Starting-Jacks forEngine Fly-Wheels, was erroneously written and printed George W.Wheelwright, whereas said name should have been Written and printedGeorge W. Wheelwrtght, Jam; and that the said Letters Patent should beread With this correction thereinthat the same may conform to the recordof the case in the Patent Offic e.

Signed, 'countersigned, and sealed this 22d day of January, A. D., 1901.

[SEAL] F. L. CAMPBELL,

Assistant Secretary of the Interior.

Gountersigned G. H. DUELL,

It is hereby certified that the name of the assignee in Letters PatentNo. 66 5t0f Commissioner of Patents.

